chore: Fix site deploy script

package.json

@@ -60,7 +60,7 @@
     "compile": "antd-tools run compile",
     "compile:less": "antd-tools run compile:less",
     "changelog": "node ./scripts/print-changelog",
-    "predeploy": "antd-tools run clean && npm run site && cp CNAME _site && cp -r _site && npm run site:test",
+    "predeploy": "antd-tools run clean && npm run site && cp CNAME _site && npm run site:test",
     "deploy": "bisheng gh-pages --push-only --dotfiles",
     "deploy:china-mirror": "git checkout gh-pages && git pull origin gh-pages && git push git@gitee.com:ant-design/ant-design.git gh-pages",
     "dist": "antd-tools run dist",